Ein Herz, ein Sinn is a polka mazur by Johann Strauss (son) (op. 323). The work was performed for the first time on 11 February 1868 in the Redouten-Saal of the Vienna Hofburg.
The polka was written for the citizens' ball at the 1868 carnival and was performed at this event in the Vienna Hofburg in the presence of Emperor Franz Joseph I and dedicated to the ball committee. Incidentally, it was to be the last civic ball of this kind. Soon afterwards, the committee was dissolved and there were no more civic balls for some time. In the so-called Gründerzeit, other organisations became more important and the industrial society with its balls, for example, played an increasingly important role. The bourgeoisie (and the civic balls) were pushed into the background. The polka Ein Herz, ein Sinn is in a way also a farewell composition to the bourgeois balls. In 1899, Adolf Müller also drew on this polka when he put together the operetta Wiener Blut from musical motifs by Johann Strauss, who had died shortly before.
 
source: Wikipedia